package com.app.kit;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

@Slf4j
public class IPUtils {

	/**
	 * 获取IP地址
	 * <p>
	 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
	 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
	 */
	public static String getIpAddr(final HttpServletRequest request) {
		if (request == null) {
			return "";
		}
		String ip = null;
		try {
			ip = request.getHeader("x-forwarded-for");
			if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("Proxy-Client-IP");
			}
			if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("WL-Proxy-Client-IP");
			}
			if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_CLIENT_IP");
			}
			if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_X_FORWARDED_FOR");
			}
			if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getRemoteAddr();
			}
		} catch (final Exception e) {
			log.error("IPUtils ERROR ", e);
			ip = "127.0.0.1";
		}

		//        //使用代理，则获取第一个IP地址
		//        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
		//			if(ip.indexOf(",") > 0) {
		//				ip = ip.substring(0, ip.indexOf(","));
		//			}
		//		}

		return ip;
	}

	public static String getLocalIp() {
		try {
			return InetAddress.getLocalHost().getHostAddress();
		} catch (final UnknownHostException e) {
			return "127.0.0.1";
		}
	}

}
